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Precisely cast blade and manufacturing method thereof

A precision casting and manufacturing method technology, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of many surface and internal defects, unreasonable design, insufficient casting process parameters, etc., to achieve plasticity enhancement and strength and increased durability

Active Publication Date: 2014-01-15
苏州华宇精密铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of mold forming methods and the unreasonable design of the parameters of the casting process, there are many surface and internal defects of the molded parts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A precision casting blade, the blade is a high-plasticity TiAl-based alloy, expressed in weight percentage, the composition of the high-plasticity TiAl-based alloy is: Al: 40%, Cr: 5.8%, V: 7.8%, Ta : 0.07%, Mg: 0.78%, rare earth: 0.07%, Nb: 0.06%, the balance is Ti and unavoidable impurities;

[0022] At the cross section 2.5mm below the surface of the highly plastic TiAl-based alloy blade, the volume concentration of Mg segregated on the grain boundary and phase boundary is 21%;

[0023] The tensile strength of the high-plasticity TiAl-based alloy blade is 560 MPa, and the yield strength is 692 MPa.

Embodiment 2

[0025] The manufacturing method of the blade of precision casting is characterized in that, comprising the following steps:

[0026] 1) Precision casting, preparing iron-based superalloy materials according to the chemical composition of high-plasticity TiAl-based alloys, using water-soluble cores, using existing system designs to obtain models, using rapid prototyping machines, and using existing laser sintering to complete layer-by-layer sintering and aggregation Styrene powder, dipped in wax to make investment pattern, and then clean the surface and interior of investment pattern; dip the investment pattern into the surface coating and dip it in slurry, then take it out; the surface coating is zirconium oxide, zirconium diacetate , Fatty alcohol polyoxyethylene ether and n-butanol are obtained by stirring and standing according to the ratio of 3.9:1:0.0004:0.0007 by weight. Then, the surface layer is sanded and dried to obtain a mold shell, which is put into a heating furna...

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Abstract

The invention discloses a precisely cast blade which is made of high-plasticity TiAl-base alloy comprising the following components in percentage by weight: 38-42% of Al, 4.8-7.8% of Cr, 7.2-8.5% of V, 0.02-0.10% of Ta, 0.62-0.85% of Mg, 0.02-0.10% of rare earth, 0.02-0.08% of Nb and the balance of Ti and inevitable impurities. The volume concentration of Mg segregated on a crystal boundary and a phase boundary at the cross section of 2-3 mm below the surface of the high-plasticity TiAl-base alloy blade; the tensile strength of the high-plasticity TiAl-base alloy blade is 520-580 MPa and the yield strength is 680-720 MPa.

Description

technical field [0001] The invention relates to the field of precision casting, in particular to a blade and a precision casting method thereof. Background technique [0002] Titanium-aluminum alloy is widely used in aerospace industry, energy industry, marine transportation industry, etc. due to a series of excellent characteristics. The European Space Agency has also launched an aeronautical research program aimed at mastering titanium-aluminum-based alloy aeroengine blades and gas turbine blades. Aircraft engine thrust-to-weight ratio is one of the main indicators for evaluating modern aircraft engines, and it plays a decisive role in aircraft performance. When it is currently applied to engine blades, the more common forming method is the precision casting method. TiAl-based alloy components prepared by investment casting technology, especially components with complex shapes, can obtain precision and complex components with no margin or nearly no margin, greatly reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00B22C3/00C21D1/18
Inventor 王强
Owner 苏州华宇精密铸造有限公司
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